blackmarr



F. S. BLACKMARB.

` DIFFERENTIALLY GEARED DRUM. APPLICATION FILED MMI. a. I9I7.

1,3 1 6,936. Patented Sept. 23, 1919.

F. S. BLACKMARR.

DIFFERENTIALLY GEARED DRUM.

Arme/mon man MAR. a. 1911.

, 1,316,936'. Pm'nasept. 23, 1919.

2 SHEETS-SHEET 2- UNTTE sTATEs PATENT oEEroE.

FREDERICK S. BLACKMARR, OF BAYEIELD, WISCONSIN, ASSIGNOR T0 BLACKMAIRRMACHINE COMPANY, 0F IBAYFIELD, WISCONSIN, A CORPORATION' OF WISCONSIN.

DIFFERENTIALLY-GEARED DRUM.

Specification of Letters Patent. Patented Sept. 23, 1919.

Application led March 8, 1917. Serial No. 153,396.

To all 'whom t may concern:

Be it known that I, FREDERICK S. BLAoK- MARR, a citizen of the UnitedStates, and resident of Bayfield, in the county of Bayfield and State ofWisconsin, have invented certain Improvements in Differentially- GearedDrums, of which the following is a specification. l

This invention relates to improvements in drums designed for hoisting,pulling or moving heavy loads.

The objects I have in View are to provide a drum that is simple inconstruction; that is so geared as to multiply many times the powerapplied; that is automatically locked when the shaft passing through "ftis stationary; and in which the gearing can be quickly and easilydisconnected, leaving the drum to turn freely in either` direction.

The invention consists generally in the constructions and combinationshereinafter described and particularly pointed out inthe claims.

In the accompanying drawings formlng part of this specification,

Figure 1 is a longitudinal, vertical section of a drum embodying myinvention, a suitable engine or motor being shown coupled to the drumshaft, and the gearing being shown in position for rotating the drum.

Fig. 2 is a similar view, the engine or motor being omitted and thegearing being unshipped or disconnected so as to permit the drum to turnfreely in either direction.

Fig. 3 is a Vertical section on line 3-3 o Fig. l.

Fig. 4 is a similar section on line 4 4 of Fig. 1,

Fig. 5 is a side elevation, and

Fig. 6 an end elevation of the sleeve that connects the drum and thegear.

The drum frame or casing may be of any suitable construction. As hereshown the barrel 2 of the' drum is provided at itsends with ringgudgeons 3 and 4 that are mounted to revolve in bearings in the circularplates 5 that are secured to the upright substantially circular or ringframes 6 and 7 having suitable feet or bases 8. The frames 6 and 7 areconnected at the bottom by the flanged plate 9, at the top by theflanged plate 10, and at the sides,-front and bach-by flanged bars 11.An internal ring gear 12 is secured to the front of the frame 7. Outsideof the ring gear I arrange a spider 13 that is provided at its centerwith a bearing 14: for the shaft l5. The other end of the shaft ismounted in a bearing block 16 carried by and secured to the frame 6. Theshaft. 15 is provided near one end with an eccentric 17. A gear 18,having a hub 19 provided at one end with an annular groove 20 and at theother end with a square or rectangular recess 2l, is mounted on theeccentric portion 17 of the shaft 15. 'The gear 18 is of slightly lessdiameter than the ring gear 12, this difference in diameter being equalto the throw of the eccentric 17, or the difference between the diameterof the eccentric 17 and the diameter of the shaft 15. The gear 18 hasalso a few less teeth than the ring gear 12. As here shown the gear 18has sixty-seven teeth, and the ring gear 12 has seventy teeth.

A lever 22 is pivoted on the spider 13 and is provided with a fork 23that engages the groove 20 in the hub 19 of the gear 18. By this leverthe gear 18 may be moved into and out of engagement with the ring gear12.

The barrel of the drum has a comparatively large opening extendingthrough it and this opening in the rear portion of the barrel is ofpolygonal (preferably rectangular) form in cross section. A sleeve 24having the opening through it slightly flaring at'its forward end, isarranged within the opening in the drum. The sleeve is polygonal(preferably rectangular) in cross section at or near each end, thepolygonal portion 25 at the rear end of the sleeve being placed at anangle to the polygonal portion 26 at the front end (see Fig. 6).

The polygonal portion25 of the sleeve is placed within the polygonalportion' of the opening in the barrel of the drum and the polygonalportion 26 is placed within the socket or recess 21 in the gear 18 andit is held therein as the gear is moved longitudinally on the shaft 15to bring it out of mesh with the ring gear 12, by a plate 27 secured tothe hub of the gear and projecting `over the edge of the recess. Thesleeve moves longitudinally on the shaft with the gear 18 but does notat any time have its rectangular portion drawn outl of engagement' withthe rectangular portion of the opening in the drum. This connectionforms a universal joint betweenv the gear 18 and the barrel ofthe drum.

I prefer to drive the mechaI-iismA from a suitable motor or enginecoupled directlyto the shaft 15. Ihave here shown an engine 28 havingits shaft 29 in line with the shaft 15, and the two shaft-s providedwith clutch members 30 and 31, and one of said members provided with anoperating lever 32;

As I frequently use this drumY in pulling up stumps or rocks, I haveshown the drum Vand engine mounted uponv suitable timbers will,therefore, take twenty-three and-onethirdV revolutions of the shaft 15to produce one revolution of the gear 18 and one revolution of the drum.The power applied to the shaft 1 5"will be multiplied on the drumtwenty-three and'V one-third times less the loss from friction. The drumwill, therefore, be rotated at only about one twentythird of the speedof the motor. This will. give the' drum' a slow speed with great power.

In pulling stumps the base of the machine will be suitably anchored anda cable extending from the drum will be attached to the stump. In anapplication of even date herewith entitled Stump puller and sta-cheri Ihave' illustrated' the arrangement' of this -drum in ja stump'-pullingmachine.

will be noted that the drum can only turn as the shaft 15 is rotated.Whenever the shaft 15 is stationary the 'drum is locked against movementin veither direction. The

"gear 18 can be moved quickly into or out of engagement with theringgear12, and when -thes'e parts are'out of engagement the drum will turnfreely in either direction'. n

I do not limit myself to thedetail's of construction herein sh'own anddescribed, as

the same may be varied in many "particulars l -without d'epa-r-ting'frommy invention.

f I claim as my invention: i v 1.' The combination, with a rotatabledrum "and a frame in which itis mounted, of a stationary ringgear-coaxial with said drum, fa rotatabl'ezshaft concentric with said:drum randprovi'ded" with an 4eccentric in the plane of said ring gear, agear mounted upon the eccentric portion of said shaft for longitudinalmovement thereon and meshing with said ring gear, said gear being ofless diameter and having fewer teeth than the Vring gear, andV meansconnecting said gear and saidv drum for simultaneous rotation, Asaidmeans including a member loosely encircling said shaft and slidablethereon with said gear.

2. The combination, with a rotatable drum and a frame 1n which it 1smounted, of a .stationary ring gear coaxial with said drum, a

rotatable shaft concentric with said drum and provided with an eccentricinthe plane of said ring gear and projecting forward therefrom, a gearslidably'mounte'd upon the eccentric portion of said shaft, means forbringing said gear into or Vout-of mesh with said ring gear, said gear'beingofless diameter andl having fewer teeth than the ring gear, andmeans connecting said gear and said drum for .simultaneous rotation,said means comprising a member loosely encircling said shaft and havingits ends engaging sockets arranged in eccentric relation in saidoear anddrum. f

3. p he combination, with a rotatable drum and aframev in which it ismounted,` of a f stationary ring gear coaxial with said drum, ashaft-passing through the axis of :said 'drum and provided with aneccentricinl the plane of said ring gear, a gear mounted to slide uponthe eccentric portion of said shaft andV meshing with said' ring gear,said gear being of less diameter and having fewer teeth than the ringgear, and a sleeve Vsurrounding said shaft andhaving one end connectedwith said gear for movement there with and the opposite end connectedwith said drum, whereby said gearv and said drum are caused to rotatetogether. f

4. The combination,` with a rotatable drum and a frame in which it ismounted, of a y stationary ring gear coaxial with said drum,

a shaft having its axis concentric with-said drum, bearings in whichsaid shaft is rotatably mounted, said shaft being provided with anyeccentric in theV plane of said ring gear, a gear mounted upon theeccentric portion of said shaft and meshing ywith said ring gear, saidgear being of less diameter and having fewer teeth than the ring gear,and a sleeve having its ends connected-respectively to said drum andsaid ear, the

end of said sleeve that is connecte Ito said *gear moving eccentrically.with the gear.

5. The combination, with a rotatable drum and a frame in which it ismounted, of a .stationary ring gear coaxial with said drum,

a shaft passing through the axis of said drum and provided with aneccentric in the plane ofs'aidring gear, a gear mounted upon theeccentric portion of said shaft and meshving with said ring gear, saidgear being of less diameter and having fewer teeth than the rin gear,and a sleeve loosel surrounding sai shaft and provided lwit polygonalends, one of which is arranged in a polygonal opening in the drum andthe other in a polygonal opening in the gear.

6. The combination, with a rotatable drum and a frame in which it ismounted, of a stationary ring gear coaxial with said drum, a shaftpassin through the axis of said drum and provided with an eccentric inthe plane of said ring gear and projecting forward therefrom, a gearslidably mounted upon the eccentric portion of said shaft, means forbringing said shaft into and out of mesh with said ring gear, said gearbeing of less diameter and having fewer teeth than the ring gear, asleeve surrounding said shaft and provided with poly onal ends one ofwhich is arranged in a po ygonal opening in the drum and the other in apolygonal opening in the gear, and means causing said sleeve to movelongitudinally with said gear as it is shifted into or out of mesh withsaid ring gear without being disconnected from said drum.

7. The combination, with a rotatable drum and a frame on which it ismounted, of a stationary ring gear coaxial with said drum, a shafthaving bearings, and its axis concentric with said drum, said shafthaving an eccentric thereon, a gear mounted on the eccentric portion ofsaid shaft for movement into engagement or out of engagement with theteeth of said gear ring, and having fewer teeth than said ring, and adriving connection between said gear and drum, and mounted to be madeoperative when said gear is engaged with said ring, or inoperative whensaid gear is disengaged from said ring.

In witness whereof I have hereunto set my hand this 5th day of December,1914.

FREDERICK S. BLACKMARR.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

